have the same sled (currently down)
initially it went back to dealership with same issue
after 3rd visit they realized the main harness needed
to be replaced. seems the 05 models had harness issues and this one slipped through! maybe yours aswell?
hope this helps.

Did you confirm the throttle cable is fully seated in the throttle block? If yes, next check the throttle body's are returning to closed position. Most common issue, could also be a vac leak, throttle body's sitting properly in the intake boots?

So after a week and a half a the dealer, I get my sled back. They tell me that there's nothing wrong with it, as it idles fine and had no problems when they rode it around. ????? So I pick it up and took it for a short ride. Ran fine, although I wondered if temperature had anything to do with it.( only -7C out) I figure okay let's go for a rip today, lot colder (-20C) and I didn't get 2 miles before it bogged a bit. I decided to just pin it and it was going, then.... shut right down dead. If I tried to start it, it would run for a sec at about 900RPM and quit. So back to the dealer, where they did not like me and the anger I was exuding. Let's see what happens now